论文标题
基于串联的骨气和离散可变量量子代码的量子中继器
Quantum repeaters based on concatenated bosonic and discrete-variable quantum codes
论文作者
论文摘要
我们提出了一个基于量子纠正的量子中继器的架构，该体系结合了用于离散和连续可变量子信息中的技术。具体而言，我们建议在由两个级别组成的串联代码中编码传输量子位。在第一级，我们使用一个连续变量的GKP代码，以单个玻感模式编码量子。在第二级，我们使用一个小的离散代码。这样的架构具有两个重要功能。首先，在两种不同类型的中继器中纠正了两个级别的错误。这使得在实用方案中获得所需的性能，并且相对于所有中继器相同的建筑，成本降低了。其次，在较低级别上使用连续变量的GKP代码会生成其他模拟信息，从而增强了第二级代码的错误校正功能，从而可以使用仅四个或七个光学模式组成的编码可以长距离通信。
We propose an architecture of quantum-error-correction-based quantum repeaters that combines techniques used in discrete- and continuous-variable quantum information. Specifically, we propose to encode the transmitted qubits in a concatenated code consisting of two levels. On the first level we use a continuous-variable GKP code encoding the qubit in a single bosonic mode. On the second level we use a small discrete-variable code. Such an architecture has two important features. Firstly, errors on each of the two levels are corrected in repeaters of two different types. This enables for achieving performance needed in practical scenarios with a reduced cost with respect to an architecture for which all repeaters are the same. Secondly, the use of continuous-variable GKP code on the lower level generates additional analog information which enhances the error-correcting capabilities of the second-level code such that long-distance communication becomes possible with encodings consisting of only four or seven optical modes.
